ImmutableStringBuilder.cpp (1664B)
1 // 2 // Copyright 2018 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 // ImmutableStringBuilder.cpp: Stringstream-like utility for building pool allocated strings where 7 // the maximum length is known in advance. 8 // 9 10 #include "compiler/translator/ImmutableStringBuilder.h" 11 12 #include <stdio.h> 13 14 namespace sh 15 { 16 17 ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const ImmutableString &str) 18 { 19 ASSERT(mData != nullptr); 20 ASSERT(mPos + str.length() <= mMaxLength); 21 memcpy(mData + mPos, str.data(), str.length()); 22 mPos += str.length(); 23 return *this; 24 } 25 26 ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const char *str) 27 { 28 ASSERT(mData != nullptr); 29 size_t len = strlen(str); 30 ASSERT(mPos + len <= mMaxLength); 31 memcpy(mData + mPos, str, len); 32 mPos += len; 33 return *this; 34 } 35 36 ImmutableStringBuilder &ImmutableStringBuilder::operator<<(const char &c) 37 { 38 ASSERT(mData != nullptr); 39 ASSERT(mPos + 1 <= mMaxLength); 40 mData[mPos++] = c; 41 return *this; 42 } 43 44 void ImmutableStringBuilder::appendDecimal(const uint32_t &u) 45 { 46 int numChars = snprintf(mData + mPos, mMaxLength - mPos, "%d", u); 47 ASSERT(numChars >= 0); 48 ASSERT(mPos + numChars <= mMaxLength); 49 mPos += numChars; 50 } 51 52 ImmutableStringBuilder::operator ImmutableString() 53 { 54 mData[mPos] = '\0'; 55 ImmutableString str(static_cast<const char *>(mData), mPos); 56 #if defined(ANGLE_ENABLE_ASSERTS) 57 // Make sure that nothing is added to the string after it is finalized. 58 mData = nullptr; 59 #endif 60 return str; 61 } 62 63 } // namespace sh